package com.kiku.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.kiku.reggie.common.BaseContext;
import com.kiku.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @className: LoginCheckFilter
 * @description: TODO 类描述
 * @author: kiku
 * @date: 2023/10/17 17:46
 **/
@WebFilter(filterName = "LoginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取本次请求的url
        String requestURI = request.getRequestURI();
        log.info("拦截到了请求{}", requestURI);
        //定义不需要进行处理的请求路径
        String urls[] = new String[]{"/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //2.判断本次请求是否需要进行处理
        boolean check = check(urls, requestURI);
        //3.若不需要进行处理则直接放行
        if (check) {
            log.info("本次请求不需要进行处理{}", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //4.判断登录状态，如果已经实现了登录就进行放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户id为{}的用户已登录", request.getSession().getAttribute("employee"));
            Long Id = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(Id);
            filterChain.doFilter(request, response);
            log.info("线程Id为:{}", Thread.currentThread().getId());
            return;
        }
        //4.2判断移动端登录状态，如果已经实现了登录就进行放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户id为{}的用户已登录", request.getSession().getAttribute("user"));
            Long Id = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(Id);
            filterChain.doFilter(request, response);
            log.info("线程Id为:{}", Thread.currentThread().getId());
            return;
        }
        //5.若还未登录则返回未登录结果,利用输出流的方式向客户端页面响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }

    //进行路径匹配，实现判断本次请求是否需要进行放行
    public boolean check(String urls[], String requestURL) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURL);
            if (match) {
                return true;
            }

        }
        return false;
    }

}
